Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.55 as soon as you get in the taxi, to which a charge of $2.20 per mile is added. Find an equation that can be used to determine the cost, C(x), of an x-mile taxi ride.
A. C(x) = 2.20 + 2.55x
B. C(x) = 4.75x
C. C(x) = 3.25x
D. C(x) = 2.55 + 2.20x
Answer: D
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Use the regression formula for the data below to estimate the value of 
.
x 1.47 3.18 4.05 6.17 y 10.09 15.41 17.78 24.33
What will be an ideal response?
Simplify the rational expression. If the expression is already in simplest form, state this as your answer.
A. simplest form B. -1 C. 1 D. -x
Identify the polygon.
A. heptagon B. pentagon C. quadrilateral D. hexagon
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
(i) Graph f in [0, 85, 5] by 
(ii) Use the intersection-of-graphs method to estimate the x-values where 75% to 90% of the pollutants are removed.
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A. 
75% to 90% are removed when
about 46 to 55 liters of air are
filtered.
B. 
75% to 90% are removed when
about 38 to 46 liters of air are
filtered.
C. 
75% to 90% are removed when
about 25 to 31 liters of air are
filtered.
D. 
75% to 90% are removed when
about 31 to 38 liters of air are
filtered.